The battery when connected seems to interfere with boot up. I can boot this machine, the dreaded 820-2915 IF I unplug the battery. I can plug the battery in after it booted and it will happily charge the battery. I tried with 2 known good batteries, but the issue remains. Battery prevents boot. Any clues. Board looks clean, no spills, no burned components ...
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Re: 2011 MBP A1286 boots on mag only, battery prevents boot
Is the battery recognized properly in macOS? Does it charge/discharge battery correctly? Does it run on battery (after unplugging Magsafe) for at least 10 minutes?
Measure voltage on PPBUS_G3H, PP3V42_G3H, SYS_DETECT_L and PM_BATLOW_L on battery only.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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Hi everyone, I have this 2011 MacBook Pro 15" model 820-2915-B which has a problem.
I turn it on, the startup sound is heard but the screen doesn't turn on, not even the backlight. The keyboard lights up after a while and the capslock works. If I press any key I can hear sounds as if the system is booting.
I thought it was a screen problem but after changing it the problem remains.
What could I do? -
Hello everyone,
I'm facing an issue with a HEG-001 motherboard that is unable to complete the Second-Stage Boot. I'd like to start directly with my conclusion, which is the decision to replace the MAX77621AEWI chip, and understand if it could be a correct evaluation.
Before I dive into the process that led me to this decision, I want to mention that I have a fully equipped lab where I can perform any kind of tests.
Let's begin:
Following some guides online, I tried to understand how the Boot phase of the Nintendo Switch works, and what are the... -
I'm using Xiaomi Router 4A gigabit edition as wireless repeater. It worked fine for 2 years or so, but last week, wireless started to disappear.
When I unplug/replug the power, it was working fine for a day/half a day or so until it freezes again.
After testing with different power supply adapters and concluding it wasn't the issue I finally opened the case and this was the situation:
Anyway I proceed to clean up the mess and replace all caps but unfortunately it made the situation worse. Now router can't even boot, either it freezes during... -
Hi everyone. Just a reminder I am not a professional repair technician, fixing Apple electronics is my hobby.
Recently got my hands on MacBook Pro A2289 with interesting behavior. Pristine condition, no water damage, no visual issues whatsoever. It has no image, no CapsLock, no life except the fan is spinning. But it is able to boot into DFU and recognized by another MacBook. I tried to revive and restore the laptop, but the process ends when the MacBook usually should show an Apple logo with a progress bar. I assume the main power lines and T2 are working. It seems like the Intel... -
Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I...
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